HST Calibration Reference Data System (CRDS)

 

NOTICE

The term "operational" has changed to "latest" when referring to the newest CRDS Context available. For more information, please refer to the user guide.

Documentation updates are ongoing. If something in the user guide is ambiguous, please reach out to the CRDS team or file a help desk ticket.


 

Obtain Best Reference Files

  1. Using the Command Line
  2. From Dataset ID or FITS Header Upload
  3. Exploring with Instrument Parameters

Reference File Database Services

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  3. Recent Activity

Latest References (under context hst_1303.pmap)

acs

hst_acs_0565.imap      Toggle N/A


atodtab ---- Analog To Digital Lookup Table

biasfile ---- Bias Frame

bpixtab ---- Data Quality (Bad Pixel) Initialization Table

ccdtab ---- Ccd Parameters Table

cfltfile ---- Coronagraphic Spot Flat Image

crrejtab ---- Cosmic Ray Rejection Parameter Table

d2imfile ---- Column Correction File

darkfile ---- Dark Frame

dgeofile ---- Geometric Distortion Correction File

drkcfile ---- Cte Corrected Dark

flshfile ---- Post-flash Image

idctab ---- Image Distortion Correction File

imphttab ---- Photometry Keyword Table

mdriztab ---- Multidrizzle Parameter Table

mlintab ---- Mama Linearity Table

npolfile ---- Non-polynomial Offset

oscntab ---- Overscan Region Table

pctetab ---- Pixel CTE Correction Table

pfltfile ---- Pixel To Pixel Flat Field Image

satufile ---- Full-Well Saturation Level Map

shadfile ---- Shutter Shading Correction Image

snkcfile ---- Sink Pixel Correction Image

spottab ---- Spot Position Table

cos

hst_cos_0375.imap      Toggle N/A


badttab ---- Bad Time Interval Table

bpixtab ---- Data Quality (Bad Pixel) Initialization Table

brftab ---- Baseline Reference Frame Table

brsttab ---- Burst Parameters Table

deadtab ---- Deadtime Reference Table

dgeofile ---- Geometric Distortion Correction File

disptab ---- Dispersion Relation Table

flatfile ---- Flat Field

fluxtab ---- Sensitivity Reference Files

geofile ---- Geometric Distortion Correction

gsagtab ---- Gain Sag Reference Table

hvdstab ---- Reference file that contains the slopes, y intercepts, and zero points of a high voltage-dependent sensitivity correction for COS FUV

hvtab ---- High Voltage Reference Table

lamptab ---- Template Calibration Lamp Spectra Table

phatab ---- Pulse Height Parameters Table

proftab ---- 2D Spectrum Profile Table

spottab ---- Spot Position Table

spwcstab ---- Spectroscopic WCS Parameters Table

tdstab ---- Time Dependent Sensitivity Table

tracetab ---- 1D Spectral Trace Table

twozxtab ---- Two-Zone Spectral Extraction Parameters Table

wcptab ---- Wavecal Parameters Reference Table

xtractab ---- 1-d Extraction Parameters Table

xwlkfile ---- X Walk Correction Lookup Reference Image

ywlkfile ---- Y Walk Correction Lookup Reference Image

nicmos

hst_nicmos_0250.imap      Toggle N/A


darkfile ---- Dark Frame

flatfile ---- Flat Field

idctab ---- Image Distortion Correction File

illmfile ---- Illumination Pattern File

maskfile ---- Static Mask File

nlinfile ---- Detector Linearity Correction File

noisfile ---- Detector Read-noise File

pedsbtab ---- pedsbtab

phottab ---- Phototmetric Calibration Table

pmodfile ---- Persistence Model Files

pmskfile ---- Persistence Mask Files

rnlcortb ---- Nonlinearity Power Law Table

saacntab ---- SAACLEAN Task Parameters

saadfile ---- Post Saa Dark Assoc.

tdffile ---- Temperature Dependent Flat Fields

tempfile ---- Temperature-dependent Dark Reference File

zprattab ---- Nonlincor Zeropoint Scaling Table

stis

hst_stis_0393.imap      Toggle N/A


apdestab ---- Aperture Description Table

apertab ---- Aperture Throughput Table

biasfile ---- Bias Frame

bpixtab ---- Data Quality (Bad Pixel) Initialization Table

ccdtab ---- Ccd Parameters Table

cdstab ---- Cross-disperser Scattering Table

crrejtab ---- Cosmic Ray Rejection Parameter Table

darkfile ---- Dark Frame

disptab ---- Dispersion Relation Table

echsctab ---- Echelle Scattering Table

exstab ---- Echelle Cross-Dispersion Scattering Table

gactab ---- Grating-Aperture Correction Table

halotab ---- Detector Halo Table

idctab ---- Image Distortion Correction File

imphttab ---- Photometry Keyword Table

inangtab ---- Incidence Angle Correction Table

lamptab ---- Template Calibration Lamp Spectra Table

lfltfile ---- Low-order Flat Field Image

mlintab ---- Mama Linearity Table

mofftab ---- Mama Offset Correction Table

pctab ---- Photometric Correction Table

pfltfile ---- Pixel To Pixel Flat Field Image

phottab ---- Phototmetric Calibration Table

riptab ---- Echelle Ripple Table

sdctab ---- 2-d Spectrum Distortion Corrections

sptrctab ---- 1-d Spectrum Trace Table

srwtab ---- Scattering Reference Wavelength Table

tdctab ---- Nuv Dark Correction Table

tdstab ---- Time Dependent Sensitivity Table

teltab ---- Telescope Point Spread Function Table

wcptab ---- Wavecal Parameters Reference Table

xtractab ---- 1-d Extraction Parameters Table

synphot

hst_synphot_0079.imap      Toggle N/A


obsmodes ---- Observing Modes Table

thermal ---- Component Thermal Tables

thruput ---- Component Throughput Tables

tmctab ---- Master Component Lookup Table

tmgtab ---- Graph Table

tmttab ---- Thermal Component Lookup Table

wfc3

hst_wfc3_0640.imap      Toggle N/A


atodtab ---- Analog To Digital Lookup Table

biacfile ---- CTE Bias Frame

biasfile ---- Bias Frame

bpixtab ---- Data Quality (Bad Pixel) Initialization Table

ccdtab ---- Ccd Parameters Table

crrejtab ---- Cosmic Ray Rejection Parameter Table

d2imfile ---- Column Correction File

darkfile ---- Dark Frame

dfltfile ---- Delta Flat Field Image

drkcfile ---- Cte Corrected Dark

flshfile ---- Post-flash Image

idctab ---- Image Distortion Correction File

imphttab ---- Photometry Keyword Table

mdriztab ---- Multidrizzle Parameter Table

nlinfile ---- Detector Linearity Correction File

npolfile ---- Non-polynomial Offset

oscntab ---- Overscan Region Table

pctetab ---- Pixel CTE Correction Table

pfltfile ---- Pixel To Pixel Flat Field Image

satufile ---- Full-Well Saturation Level Map

snkcfile ---- Sink Pixel Correction Image

wfpc2

hst_wfpc2_0250.imap      Toggle N/A


atodfile ---- Analog To Digital Converter Lookup Table

biasfile ---- Bias Frame

darkfile ---- Dark Frame

dgeofile ---- Geometric Distortion Correction File

flatfile ---- Flat Field

idctab ---- Image Distortion Correction File

maskfile ---- Static Mask File

offtab ---- Inter-chip Offsets Table

shadfile ---- Shutter Shading Correction Image

wf4tfile ---- WF4 Correction Table


Context History (more history, all contexts, build contexts)

Start Date Context Status Description
2025-12-31 hst_1303.pmap latest The ACS WFC bias, dark, CTE dark, and sink files were generated following the ACS WFC anneal on December 21, 2025, and should be used to calibrate ACS WFC observations taken between November 17, 2025 and December 21, 2025.
2025-12-29 hst_1302.pmap archived Delivery of new STIS CCD bias and dark reference files for CCD data taken between Nov 26 and Dec 25, 2025. The files were generated from data taken in the same time frame under STIS calibration programs 18157 and 18154.
2025-12-23 hst_1301.pmap archived The COS team has delivered the first operational reference files for use at LP10, replacing the previous temporary LP10 reference files. The files delivered include a LAMPTAB, DISPTAB, XTRACTAB, TWOZXTAB, PROFTAB, TRACETAB, FLATFILE, and FLUXTAB. In Fall 2025, at the start of HST Cycle 33, LP10 was enabled for use with the G160M/1533, 1577, 1589, 1600, 1611, and 1623 modes. These eight reference files provide optimally calibrated data at LP10 and allows for TWOZONE extraction at LP10.
2025-12-17 hst_1300.pmap archived These WFC3 UVIS superdarks will affect all UVIS data taken from November 11, 2025 to December 10, 2025. Currently, the automated calibration pipeline and CRDS have only WFC3 UVIS drk and dkc reference files with USEAFTER dates of up to November 9, 2025. The automated pipeline should now use these reference files to perform dark subtraction on any UVIS datasets obtained between the dates above, as they represent the most accurate picture of dark current and hot pixels for this time period. This new bad pixel table with USEAFTER of November 11, 2025 was generated using data taken from November 11, 2025, through December 13, 2025. Currently, the Calibration Reference Data System only has WFC3 UVIS bad pixel reference tables up to a USEAFTER date of October 16, 2025. The automated pipeline should now use this reference file as the bad pixel table on any UVIS datasets obtained from November 11, 2025 to present because it represents the most accurate measure of pixel stability at the time of the science observation. These WFC3 UVIS bad pixel files were generated using 900 second dark exposures from the HST Cycle 32 and 33 daily monitoring programs 17665, 17669, 17944, and 17946. More information about the UVIS bad pixel tables is outlined in the WFC3 ISR 2018.15 and WFC3 ISR 2021.14. For more details regarding both deliveries, please see the Context History and select ,all contexts, on the CRDS homepage.